SATHEE: Solutions Question 376

Solutions Question 376

Question: 0.5 m solution of a complex of iron and cyanide ions has the depression of f.pt. to be 3.72 K ( $K_{f}$ For water $= 1.86 K m o l a l^{- 1}$ ). The formula of the complex is:

Options:

A) $K_{4} [F e {(C N)}_{6}]$

B) $K_{2} [F e {(C N)}_{4}]$

C) $K_{3} [F e {(C N)}_{6}]$

D) $F e {(C N)}_{4}$

Show Answer

Answer:

Correct Answer: C

Solution:

$Δ T_{f} (n o r m a l) = K_{f} m = 1.86 \times 0.5 = 0.93^{\circ}$ Assuming 100% ionization, i = n = No. of ions per molecule $= \frac{O b s e r v e d, Δ T_{f}}{N o r m a l, Δ T_{f}} = \frac{3.72}{0.93} = 4$

$K_{3} [F e {(C N)}_{6}] \overset{}{\to} 3 K^{+} + {[F e {(C N)}_{6}]}^{3 -}$ No. of ions = 4

Solutions Question 376

Question: 0.5 m solution of a complex of iron and cyanide ions has the depression of f.pt. to be 3.72 K ( $K_{f}$ For water $= 1.86 K m o l a l^{- 1}$ ). The formula of the complex is:

Options:

Answer:

Solution:

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NCERT Exercise Video Solution

Solutions Question 376

Question: 0.5 m solution of a complex of iron and cyanide ions has the depression of f.pt. to be 3.72 K ( Kf For water =1.86Kmolal−1 ). The formula of the complex is:

Options:

Answer:

Solution:

Engineering Preparation

Medical Preparation

NCERT Books & Solutions

Important Resources

Other Resources

Syllabus

Test Platform

Sample Mock Test

Mentorship

NCERT Exercise Video Solution

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Question: 0.5 m solution of a complex of iron and cyanide ions has the depression of f.pt. to be 3.72 K ( $K_{f}$ For water $= 1.86 K m o l a l^{- 1}$ ). The formula of the complex is: